03/10/2015 - Laserfiche WebLink

Home Browse Search

To date, TSI has completed the following tasks: Task 1: Mobilization (barge, excavation equipment on-site). Task 2 (Partial): Deployment of siltation control devices. Task 4: Removal/chipping of vegetation from dike breach and channel restoration areas, basil bark herbicide treatment of nuisance exotics on perimeter dike. Unforeseen Circumstance: Off-site Disposal of Dredged Material The Request for Proposals (RFP) that TSI bid on for the Head Island channel restoration work included, as attachments, the ACOE and FDEP permits for the project. A condition specified in those permits is that "all fill generated [from the channel excavation and dike breaches] shall be disposed of on an upland site." According to TSI representatives, TSI bid the work under the assumption that there were sufficient uplands on-site (i.e., on the Head Island impoundment dikes) to accommodate upland disposal of dredged material. In fact, TSI posed a question in an addendum to the RFP as to whether or not it would be acceptable to spread soil from excavated breaches along portions of the dike, to which county staff answered yes. Based on its understanding of staff's response, TSI submitted its $78,500 bid (substantially lower than the next lowest bid of $319,650 received by the County). At a field meeting with ACOE staff after the bid was awarded, however, TSI learned that although there are upland areas on the Head Island perimeter dike, the areas that the ACOE would allow for soil spreading are insufficient to accommodate the amount of material to be dredged. Based on an approximate two-week time frame needed for scheduling the ACOE field meeting and the subsequent finding of insufficient uplands for on-site disposal, TSI's dredging of the channel and breaches has been delayed. TSI Change Order Proposal for Off-site Disposal After learning that there are insufficient ACOE-approvable upland areas on-site for disposal of dredged material, TSI submitted an initial and then a second revised proposed change order to staff with revised costs for off-site disposal (see Attachment 3). As proposed, TSI's (revised) change order for off-site disposal is $167,560 with a per diem rate of $13,963.33, bringing total construction costs to more than $200,000, not including cost for off-site trucking of material or site restoration. In total, the proposed change order would bring the overall Head Island project total to more than $300,000. After receiving TSI's proposed change order, staff looked into alternatives for completion of the project by means other than excavation of the channel by barge. In that regard, staff obtained an engineer's cost estimate made in consultation with a qualified contractor, for a land-based excavation of the channel and breaches using small equipment, including off-site trucking of material, at a cost in the range of $127,000. That land based approach would require use of Island Drive, the northern private road within St. Christopher Harbor. Use of that road for project completion would require the cooperation of the HOA. Under the land-based approach, total project cost would be approximately $224,500. Staff's position is that TSI's proposed change order for off-site disposal of dredged material is untenable under the current funding scope of the Head Island restoration project. In recent discussions between staff, the Deputy County Attorney, and TSI on that issue, TSI indicated it was agreeable to them to be paid for work rendered, with no charge to the County for the several weeks that TSI has had its barge deployed at the work site. Staff has field -verified the work completed by TSI to date and has determined that the work has provided a public benefit in the form of exotics eradication from a County -owned conservation property. 3 172